Electric ignition device or sparking plug for internal-combustion motors.



I PATENTED SEPT. 8, 1908. C. O. BASTIAN & G. CALVERT. IGNITIGN D ELECTRIC EVIGE 0R SPARRING PLUG EOE INTERNAL COMBUSTION MOTORS.

APPLICATION FILED JUNE 27, 1906.

VE /77065363. 710W CHARL S OEME BASTIA'N AND GEORGE CALVERT, OF LONDON, ENGLAXD.

ELZECTELIG ITKON DE VICE 011 SPARKENG PLUG FDR E1F'ITEBL=I-TAL-CiIH/EEUSTIQH lironglesbur r road, London, lilriglsiul, and

GEORGE CALVERT, electrical engineer, residing at 27 Barretts Giot'e, Stoke Newington London, England, both subjects of the King Greet rlritein, have invented a new or 1111- proved Elect ic llgnitiouDeric-e or Sparking FPlug for Intcreel-Combustion .ia iotors, of vhich the following is s specification. V

This invention is designed to produce an electrical ignition device or so-celled sparking pluglor internal combustion motors which is simple and economical to produce and Which W lll afford or permit observation (from the exterior) both of the electric sparking produced through the medium of said plug and of the flame produced by the internal explosion or combustion within. the motor caused thereby, thus serviugas and coi'nbiiiiug the functions of both sparking plug or ignition device end observation who (low or means for con observation of the phenomena occurring Within the combustion chamber.

. Now according to the present lHVEIllJlOD the electric ignition device orsperlringplug (which for the sake of brevity "We will hereinafter re fer to as the spsrliihg plug ore such insulator is especially formed and constructed to resist the shock pressure and heat or sudden or e treme variations of temperature arising you: the internal combusor expiosohs Within the notor or otherthe glass which, according to this in- Wise;

use for the aforesaid purpose is Jens of the type known hreproot combusi, it has been found possible and preccon tubing such as that now found in commerce and mode for example by the firm of ion is not only transparent is 7 of shock lristiori in temperature 2 And in orde that the invention 1 more easily understood. sud rez into prscticetwe will proceed to full l. some with reference to the eccom'pe '1 drawings iuwhich: I

Figure l is e m plug in which our pr sent invention is porsted endji ig. 2 is vertical thereof. Fig. 3 is sclan Figs. 1' and 2; andl-ig. is opposite end thereof..

Lilelerrihg to Figs. 1 to 4 of the accompanyirig drawings: the insulator aof Jena glass or the like aforesaid is tubule-r advantageously with the bore of said tube arid the Walls thereof of the relative proportions 2 shown in the rewings or thereebouts shaped also at its bottom end shown or thereobouts and me is arranged any suitable mount as for example some 1115' be mounted in a. metal shell i) of the to To such as are at present generally in in pa king plugs and l suitable gland c and psclriug (Z (a. g. of ash o rerl if desired so ee a is protectv l for o illjiilj his tubular elevation or s seer-Kiri or at both e 1 're 6 or 0+ aforesaid for example the metal 5 be provided with e screw (or r means may be employed) to at the (ff 'llllil? (not shown) tie said sparking 1131 may be otheri ed so as to be adapted to fire to charge for example bv mounth said shell or mount said insulator for 11;; the other or 105 eerthed pole of the plug :to which its shown the cross-bar 9; may be attached to form the second contact.

Any suitable means of ettschrne may be provided for connecting the central insulated 11% wire e with the source of current supply for example as illustrated the said conductor 1 6 maybe conuectedtothe split oolla 'f Iprovid'ed with the clampingiscrew g by which latter the electric conductor-h from any suit 'ablefs'ource inay- =;be ele-ti ically connected and securell' to the said ilit collar f which latter is fixed on" the upper end of. the said .glass insulator a. v

' By the foregoing invention a sparking plug provided by means of which it"can be seen Whether the spark is passing, whether the cylinder is charged or not or whether such charge is under compression or not, and also afiording means for viewing the combustion of the charge Within the cylinder and judging of its composition; this combined insulator and observation indow being suitable either for testing purposes or same'can be used in practice continuously. V The aforesaid inner end or portion 0/ of the insulator a, exposed to the explosion and 1 pressure-in the cylinder is as aforesaid advantageously'roundedor conoidal as illustrated being so formed to offer the requisite resistance to shock, pressure, and change of a temperature; and also its joint in or with its m'ount I) should be pressure-tight i. .0. this may be efi'ect-ed by means of the gland c and packing rings 1 as aforesaid.

For the purpose of safety-or protection of the inner end a of the aforesaid insulator aif desired a piece of'wire gauze or finely perforated metal or the like may be placed between the inner end of the insulator and the cylinder or combustion chamber; and such gauze or thelike mav form a portion of the electrical circuit,

Any suitable means may be provided to prevent longitudinal movement of the tubular insulator a with respect to its shell I) as for example the curved annular enlargement l one end, and provided with the annular enlargement a packing material on each side ,of said enlargement, a metal shell surrounding said insulator and having the gland c, and a Wire sealed through the closed end of said tube and connected to said shell, substantially' as described. I

2. In a sparking plug forinternal combustion'engines, the combination of an insulator'l'ormed from a tube of glass closed at one end, and provided with the annular enlargement a packing material on each side of said enlargement, ametalshell surrounding said insulator and having the gland c, a Wire sealed through the closed end of said insulator and connected to said shell, and a split collar f secured to the upper end of said insulator and provided with the clamping screw 57, substantially as described.

ln'witness whereof we have hereunto set our hands in presence of two Witnesses.

CHARLES OHM-E BASTIAN GEORGE CALVERT. Witnesses: Y H. D. JAMESON, C P LIDDON 

